Composite piezoelectric sensors for smart composite structures

Blanas, P.; Das-Gupta, D.K.

doi:10.1109/ise.1999.832148

Cited by 16 publications

(8 citation statements)

References 9 publications

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“…Future transportation vehicles are likely to adopt sensor/actuator embedded composite structures to enhance performance and to monitor the health of the structure with the intention of reducing maintenance costs [1]. Such a composite structure is usually called a 'smart' structure, due to its capability of sensing and responding to the surrounding environmental situation.…”

Section: Introductionmentioning

confidence: 99%

Strain-dependent electrical resistance of multi-walled carbon nanotube/polymer composite films

Park¹,

Kim²,

Youngblood³

2008

Nanotechnology

305

221

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The strain-dependent electrical resistance characteristics of multi-walled carbon nanotube (MWCNT)/polymer composite films were investigated. In this research, polyethylene oxide (PEO) is used as the polymer matrix. Two representative volume fractions of MWCNT/PEO composite films were selected: 0.56 vol% (near the percolation threshold) and 1.44 vol% (away from the percolation threshold) of MWCNT. An experimental setup which can measure electrical resistance and strain simultaneously and continuously has been developed. Unique and repeatable relationships in resistance versus strain were obtained for multiple specimens with different volume fractions of MWCNT. The overall pattern of electrical resistance change versus strain for the specimens tested consists of linear and nonlinear regions. A resistance change model to describe the combination of linear and nonlinear modes of electrical resistance change as a function of strain is suggested. The unique characteristics in electrical resistance change for different volume fractions imply that MWCNT/PEO composite films can be used as tunable strain sensors and for application into embedded sensor systems in structures.

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Section: Introductionmentioning

confidence: 99%

Strain-dependent electrical resistance of multi-walled carbon nanotube/polymer composite films

Park¹,

Kim²,

Youngblood³

2008

Nanotechnology

305

221

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“…Interdigital transducers. Alternatively, interdigital transducers, such as polyvinylidene uoride (PVDF) piezoelectric polymer lms, are introduced to cater for more versatile applications with favourable cost [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Selective generation of Lamb wave modes and their propagation characteristics in defective composite laminates

2004

Proc. Instn Mech. Engrs, Part L: J. Mat

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Techniques for the generation of Lamb waves with purpose of non-destructive inspection (NDI) were brie y reviewed. An active excitation control circuit was designed and instrumented with an online damage diagnosis system, by which the desired fundamental symmetric Lamb mode, shear mode and antisymmetric mode can be selectively stimulated. A signal processing and identi cation algorithm in the timescale domain, using spectrographic analyses based on the wavelet transform technique, was developed to assist the wave signal interpretation. The proposed excitation methodology was applied to the study of the dispersion and propagation characteristics of Lamb waves in quasi-isotropic CF/EP composite laminates with delamination. For validation, numerical simulations were conducted in parallel with experimental investigations.

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“…The E-M impedance method was used for detection of degradation in the viscoelastic properties of the composite structure due to aging, and the GW method was used for detecting damage such as delaminations and matrix cracks. Blanas and Das-Gupta (1999) have reported on the capability of piezos for simultaneous use as GW transducers as well as load monitoring sensors for dynamic and impact loads in composite structures. The final architecture of any SHM system is determined by the type of application, structure and material combinations, and power available.…”

Section: Integration With Other Shm Approachesmentioning

confidence: 99%